src/view/options.ts


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export interface Model {
  major: boolean
  minor: boolean
  seventh: boolean
  minorSeventh: boolean
  majorSeventh: boolean
  bpm: number
  beatsPerChord: number
}

let init: Model = {
  major: true,
  minor: false,
  seventh: false,
  minorSeventh: false,
  majorSeventh: false,
  bpm: 90,
  beatsPerChord: 4
}

let key: string = 'options'

export function load(): Model {
  let str = localStorage[key]
  return str && JSON.parse(str) || init
}

export function save(options: Model): void {
  localStorage[key] = JSON.stringify(options)
}